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Quest Diagnostics Inc

DGX
Exchange
NYSE
Industry
Services-Medical Laboratories
SEC CIK
0001022079

In the last 90 days, Quest Diagnostics Inc insiders filed 0 open-market purchases and 3 sales; 1,112 institutions reported holding it in 13F filings for Q2 2026, worth $22.2B in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Quest Diagnostics Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
3 insiders, $8.32M in total
Insiders trading
3
Net value
−$8.32M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Quest Diagnostics Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Quest Diagnostics Inc
NameTitleLast reported holdingLast filingFilings, past year
Davis J. E.CEO and President122,423Sep 3, 20267
Prevoznik Michael ESVP & General Counsel36,557Aug 31, 20265
Delaney Mark ESVP & Chief Commercial Officer10,335Jul 29, 20268
Kuppusamy KarthikSVP, Clinical Solutions13,557Jul 27, 20267
Carter Robert BDirector3,864Jul 27, 20265
Gregg Vicky BDirector18,386Jul 27, 20266
Plewman PatrickSVP for Diagnostic Services15,293Jul 27, 20267
Main Timothy LDirector22,460Jul 27, 20262
Samad SamExecutive Vice President & CFO33,478Jul 27, 20266
Lassiter Wright IIIDirector10,323Jul 27, 20265
Wentworth Timothy CDirector1,358Jul 2, 20264
Pfeiffer Gary MDirector31,005May 21, 20262
Ring Timothy MDirector31,140May 21, 20262
Morrison Denise MDirector11,929May 21, 20261
Doi TraceyDirector7,748May 21, 20261
Diaz LuisDirector5,196May 21, 20261
Doherty Catherine T.EVP, Regional Businesses67,122Mar 6, 20264
Deppe Michael JSVP, Corp. Controller & CAO35,196Mar 6, 20263
Gardner Mark ASVP of Molecular Gen & Oncol4,673Sep 26, 20240
Wilensky Gail RDirector20,506May 19, 20230
Rusckowski Stephen HDirector389,597Mar 8, 20230
Guinan MarkExecutive Vice President & CFO98,981Mar 9, 20220
Eglinton Manner CarrieSVP, Advanced Diagnostics48,391Mar 9, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 3, 2026 (view filing)5:05 PM ETSep 12 daysDavis J. E.CEO and PresidentSSale−10.0K$242.72−$2.43M−7.6%122.4K after10b5-1
Aug 31, 2026 (view filing)4:37 PM ETAug 283 daysPrevoznik Michael ESVP & General CounselSSale−22.7K$243.11−$5.51M−37.6%37.6K after3 lots10b5-1
Jul 29, 2026 (view filing)5:04 PM ETJul 281 dayDelaney Mark ESVP & Chief Commercial OfficerSSale−1.60K$235.18−$376.3K−13.4%10.3K after10b5-1
Jun 8, 2026 (view filing)Jun 44 daysKuppusamy KarthikSVP, Clinical SolutionsSSale−8.15K$200.00−$1.63M−37.6%13.5K after10b5-1
Jun 2, 2026 (view filing)Jun 11 dayDavis J. E.CEO and PresidentSSale−10.0K$194.14−$1.94M−7.0%132.4K after10b5-1
Mar 6, 2026 (view filing)Mar 51 dayDoherty Catherine T.EVP, Regional BusinessesSSale−5.56K$206.21−$1.15M−7.6%67.1K after10b5-1
Mar 6, 2026 (view filing)Mar 51 dayPrevoznik Michael ESVP & General CounselSSale−3.88K$206.21−$799.7K−9.4%37.6K after10b5-1
Mar 6, 2026 (view filing)Mar 51 dayPlewman PatrickSVP for Diagnostic ServicesSSale−2.85K$206.21−$588.7K−15.8%15.2K after10b5-1
Mar 6, 2026 (view filing)Mar 42 daysKuppusamy KarthikSVP, Clinical SolutionsSSale−2.63K$204.86−$538.4K−16.4%13.4K after
Mar 4, 2026 (view filing)Mar 31 dayDoherty Catherine T.EVP, Regional BusinessesSSale−632$207.73−$131.3K−0.9%67.1K after10b5-1
Mar 4, 2026 (view filing)Mar 31 dayPrevoznik Michael ESVP & General CounselSSale−526$207.73−$109.3K−1.4%37.6K after10b5-1
Mar 4, 2026 (view filing)Mar 22 daysDavis J. E.CEO and PresidentSSale−10.0K$212.52−$2.13M−7.9%117.2K after10b5-1
Mar 4, 2026 (view filing)Mar 31 dayPlewman PatrickSVP for Diagnostic ServicesSSale−410$207.73−$85.2K−2.6%15.2K after10b5-1
Feb 20, 2026 (view filing)Feb 191 dayDoherty Catherine T.EVP, Regional BusinessesSSale−1.43K$204.83−$293.5K−2.1%68.4K after10b5-1
Feb 20, 2026 (view filing)Feb 191 dayPlewman PatrickSVP for Diagnostic ServicesSSale−958$204.83−$196.2K−5.7%15.8K after10b5-1
Feb 20, 2026 (view filing)Feb 191 dayPrevoznik Michael ESVP & General CounselSSale−1.11K$204.83−$227.6K−2.8%38.4K after10b5-1
Feb 17, 2026 (view filing)Feb 134 daysDoherty Catherine T.EVP, Regional BusinessesSSale−26.2K$206.15−$5.39M−27.8%68.1K after5 lots10b5-1
Feb 12, 2026 (view filing)Feb 102 daysPlewman PatrickSVP for Diagnostic ServicesSSale−5.66K$204.00−$1.16M−26.9%15.4K after10b5-1
Nov 28, 2025 (view filing)Nov 253 daysDavis J. E.CEO and PresidentSSale−55.1K$192.22−$10.6M−31.4%120.5K after3 lots10b5-1
Nov 28, 2025 (view filing)Nov 253 daysGregg Vicky BDirectorSSale−1.25K$191.76−$239.7K−6.8%17.0K after
Nov 20, 2025 (view filing)Nov 182 daysDelaney Mark ESVP & Chief Commercial OfficerSSale−7.95K$187.35−$1.49M−51.3%7.53K after10b5-1
Oct 24, 2025 (view filing)Oct 222 daysPfeiffer Gary MDirectorSSale−1.48K$182.40−$270.3K−4.8%29.4K after
Sep 30, 2025 (view filing)Sep 264 daysPrevoznik Michael ESVP & General CounselSSale−227$188.13−$42.7K−0.6%38.1K after2 lots10b5-1
Sep 25, 2025 (view filing)Sep 23-242 daysPrevoznik Michael ESVP & General CounselSSale−28.5K$187.12−$5.33M−42.8%38.1K after2 lots10b5-1
Aug 25, 2025 (view filing)Aug 214 daysPlewman PatrickSVP for Diagnostic ServicesSSale−1.98K$185.00−$365.4K−11.5%15.3K after10b5-1
Aug 21, 2025 (view filing)Aug 192 daysPlewman PatrickSVP for Diagnostic ServicesSSale−4.53K$183.00−$829.4K−20.8%17.2K after10b5-1
Aug 19, 2025 (view filing)Aug 154 daysPlewman PatrickSVP for Diagnostic ServicesSSale−1.98K$180.00−$355.5K−10.3%17.2K after10b5-1
Aug 8, 2025 (view filing)Aug 62 daysPlewman PatrickSVP for Diagnostic ServicesSSale−5.54K$175.00−$968.6K−22.4%19.2K after2 lots10b5-1
Aug 1, 2025 (view filing)Jul 30-312 daysKuppusamy KarthikSVP, Clinical SolutionsSSale−10.5K$167.95−$1.76M−55.4%8.45K after3 lots10b5-1
May 14, 2025 (view filing)May 12-132 daysDelaney Mark ESVP & Chief Commercial OfficerSSale−1.75K$175.52−$306.8K−18.9%7.50K after2 lots10b5-1
Apr 4, 2025 (view filing)Apr 22 daysDavis J. E.CEO and PresidentSSale−39.2K$168.46−$6.60M−23.5%127.6K after15 lots10b5-1
Apr 4, 2025 (view filing)Apr 22 daysKuppusamy KarthikSVP, Clinical SolutionsSSale−2.56K$170.00−$434.4K−19.5%10.6K after10b5-1
Mar 19, 2025 (view filing)Mar 172 daysPrevoznik Michael ESVP & General CounselSSale−4.64K$170.00−$789.3K−10.9%38.1K after10b5-1
Mar 7, 2025 (view filing)Mar 52 daysDoherty Catherine T.EVP, Regional BusinessesSSale−5.37K$174.13−$935.1K−7.3%68.1K after10b5-1
Mar 5, 2025 (view filing)Mar 41 dayDoherty Catherine T.EVP, Regional BusinessesSSale−716$175.79−$125.9K−1.0%68.1K after10b5-1
Mar 5, 2025 (view filing)Mar 41 dayPrevoznik Michael ESVP & General CounselSSale−592$175.79−$104.1K−1.5%38.1K after10b5-1
Feb 28, 2025 (view filing)Feb 271 dayPrevoznik Michael ESVP & General CounselSSale−528$172.61−$91.1K−1.3%39.0K after10b5-1
Feb 28, 2025 (view filing)Feb 271 dayDoherty Catherine T.EVP, Regional BusinessesSSale−824$172.61−$142.2K−1.2%69.2K after10b5-1
Feb 21, 2025 (view filing)Feb 201 dayPrevoznik Michael ESVP & General CounselSSale−604$170.99−$103.3K−1.5%39.8K after10b5-1
Feb 21, 2025 (view filing)Feb 192 daysPlewman PatrickSVP for Diagnostic ServicesSSale−320$169.71−$54.3K−1.7%18.1K after
Feb 21, 2025 (view filing)Feb 19-202 daysDoherty Catherine T.EVP, Regional BusinessesSSale−1.43K$170.51−$244.5K−2.0%70.5K after2 lots10b5-1
Feb 7, 2025 (view filing)Feb 52 daysGregg Vicky BDirectorSSale−1.25K$164.57−$205.7K−6.9%16.9K after
Feb 7, 2025 (view filing)Feb 52 daysDelaney Mark ESVP & Chief Commercial OfficerSSale−403$164.30−$66.2K−8.0%4.62K after
Dec 2, 2024 (view filing)Nov 293 daysPrevoznik Michael ESVP & General CounselSSale−35.1K$163.07−$5.73M−47.7%38.5K after2 lots
Dec 2, 2024 (view filing)Nov 275 daysDoherty Catherine T.EVP, Regional BusinessesSSale−33.1K$162.99−$5.40M−32.6%68.4K after2 lots
Nov 7, 2024 (view filing)Nov 61 dayDeppe Michael JSVP, Corp. Controller & CAOSSale−18.8K$154.04−$2.89M−34.9%34.9K after6 lots
Oct 30, 2024 (view filing)Oct 282 daysKuppusamy KarthikSVP, Clinical SolutionsSSale−1.77K$156.92−$278.5K−15.4%9.73K after
Sep 3, 2024 (view filing)Aug 295 daysPrevoznik Michael ESVP & General CounselSSale−32.6K$154.97−$5.04M−45.8%38.5K after
Aug 29, 2024 (view filing)Aug 281 dayKuppusamy KarthikSVP, Clinical SolutionsSSale−1.99K$153.26−$305.0K−14.8%11.5K after
Jul 26, 2024 (view filing)Jul 242 daysDelaney Mark ESVP & Chief Commercial OfficerSSale−420$143.08−$60.1K−7.7%5.02K after